ELECTROMAGNETIC INDUCTION
2 marks · EasyA student moves a straight wire downwards between the poles of a magnet. What is observed in the wire?
Explain why this happens.
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(a) A voltage (and possibly a current if it's a circuit) is produced in the wire.
(b) Because moving the wire cuts across the magnetic field lines, which induces a voltage by electromagnetic induction.
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Marking points
B1 (a) · 1 mark · Voltage (or current) induced in the wire.
B1 (b) · 1 mark · Explains that the wire cuts magnetic field lines, leading to electromagnetic induction.
Worked solution
(a) A voltage is induced in the wire.
(b) This happens because the wire moves through the magnetic field, cutting across the field lines and causing electromagnetic induction.